Better doc by explicitly using __qualname__ instead of __repr__()

[leuchtum]

Description

By explicitly using the __qualname__ string of an object (introduced in PEP 3155), the documentation does not include the <...> brackets with the memory address.

Screenshots

HereVariable.assign_attrs as an example, but more methods are affected.

Screenshot documentation BEFORE changes

Screenshot documentation AFTER changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.13%. Comparing base (497061a) to head (9b8bf1c). Report is 14 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #238 +/- ## ========================================== + Coverage 88.07% 88.13% +0.06% ========================================== Files 15 15 Lines 3413 3440 +27 Branches 789 793 +4 ========================================== + Hits 3006 3032 +26 - Misses 296 297 +1 Partials 111 111 ```

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[FabianHofmann]

great, thanks @leuchtum